Every rebuild is different, it could be 1 season to a perpetual rebuild status. Rebuilds also start at different points with different assets available.
There are a few recent rebuilds as examples; Detroit, Houston, Washington and Chicago.
Chicago thought they needed the right QB, so they made moves to posture themselves to get who they thought was the right QB. They loaded up on weapons, didn't address the O-line and added their QB. Was that the right answer and the right QB? TBD.
Washington did not have much in terms of weapons other than McLauren and Robinson, but they have a decent O-line and they knew they would get whoever fell to them so they concentrated on the line, defense and would add weapons later, but building the foundation for the QB was more important. Their QB is flourishing even without being loaded up with weapons. They are also headed to the playoffs 1 season after picking 2nd.
Houston had a good team with Watson, but his off the field stuff derailed it. They fell hard fast, but they did get some draft capital once they traded Watson, made the right hire for HC who brought a new identity and built around that identity. They built up the Defense, line and then took the QB that fell to them. The developed their WR1 in Nico Collins.
Detroit had pretty much nothing. They had to hire a HC who would bring in an identity and build around that. Campbell got rid of anyone who didn't fit his team build and Stafford who was being wasted in a rebuild. Goff needed to rebuild his career so it was a perfect match. That netted him some draft capital. He then built the trenches, with his guys. He drafted weapons on offense with the same mindset. Now, they are an offensive juggernaut in the image he wanted. Their defense is loaded with talent when healthy, but right now it's patchwork.
We have a young core of players to build around, the decision just needs to be made what will the team identity be and who fits that. This is where I believe Rizzi gets the job and KK stays as OC. This allows the offense to continue to build on what it has and they know what pieces they need. The defense is still TBD.